update syncing implementation with new downloader api

syncing/downloader/client.go

@@ -37,6 +37,7 @@ func ClientSetup(ip, port string) *Client {
 	client.conn, err = grpc.Dial(fmt.Sprintf("%s:%s", ip, port), client.opts...)
 	if err != nil {
 		log.Fatalf("fail to dial: %v", err)
+		return nil
 	}
 
 	client.dlClient = pb.NewDownloaderClient(client.conn)

syncing/errors.go

@@ -0,0 +1,8 @@
+package syncing
+
+import "errors"
+
+// Errors ...
+var (
+	ErrSyncPeerConfigClientNotReady = errors.New("client is not ready")
+)

syncing/syncing.go

@@ -1,8 +1,6 @@
 package syncing
 
 import (
-	"bufio"
-	"net"
 	"reflect"
 	"sync"
 	"time"
@@ -10,23 +8,21 @@ import (
 	"github.com/Workiva/go-datastructures/queue"
 	"github.com/harmony-one/harmony/blockchain"
 	"github.com/harmony-one/harmony/p2p"
-	proto_node "github.com/harmony-one/harmony/proto/node"
+	"github.com/harmony-one/harmony/syncing/downloader"
 )
 
 // SyncPeerConfig is peer config to sync.
 type SyncPeerConfig struct {
-	peer        p2p.Peer
-	conn        net.Conn
-	w           *bufio.Writer
-	err         error
-	trusted     bool
-	blockHashes [][32]byte
+	ip          string
+	port        string
+	client      *downloader.Client
+	blockHashes [][]byte
 }
 
 // SyncBlockTask is the task struct to sync a specific block.
 type SyncBlockTask struct {
 	index     int
-	blockHash [32]byte
+	blockHash []byte
 }
 
 // SyncConfig contains an array of SyncPeerConfig.
@@ -48,6 +44,29 @@ type StateSync struct {
 	stateSyncTaskQueue *queue.Queue
 }
 
+// GetBlockHashes ...
+func (peerConfig *SyncPeerConfig) GetBlockHashes() error {
+	if peerConfig.client == nil {
+		return ErrSyncPeerConfigClientNotReady
+	}
+	response := peerConfig.client.GetBlockHashes()
+	peerConfig.blockHashes = make([][]byte, len(response.Payload))
+	for i := range response.Payload {
+		peerConfig.blockHashes[i] = make([]byte, len(response.Payload[i]))
+		copy(peerConfig.blockHashes[i], response.Payload[i])
+	}
+	return nil
+}
+
+// GetBlocks ...
+func (peerConfig *SyncPeerConfig) GetBlocks(heights []int32) ([][]byte, error) {
+	if peerConfig.client == nil {
+		return nil, ErrSyncPeerConfigClientNotReady
+	}
+	response := peerConfig.client.GetBlocks(heights)
+	return response.Payload, nil
+}
+
 // ProcessStateSyncFromPeers used to do state sync.
 func (ss *StateSync) ProcessStateSyncFromPeers(peers []p2p.Peer, bc *blockchain.Blockchain) (chan struct{}, error) {
 	// TODO: Validate peers.
@@ -71,8 +90,10 @@ func (ss *StateSync) createSyncConfig(peers []p2p.Peer) {
 		peers: make([]SyncPeerConfig, ss.peerNumber),
 	}
 	for id := range ss.syncConfig.peers {
-		ss.syncConfig.peers[id].peer = peers[id]
-		ss.syncConfig.peers[id].trusted = false
+		ss.syncConfig.peers[id] = SyncPeerConfig{
+			ip:   peers[id].Ip,
+			port: peers[id].Port,
+		}
 	}
 }
 
@@ -83,29 +104,27 @@ func (ss *StateSync) makeConnectionToPeers() {
 	for _, synPeerConfig := range ss.syncConfig.peers {
 		go func(peerConfig *SyncPeerConfig) {
 			defer wg.Done()
-			peerConfig.conn, peerConfig.err = p2p.DialWithSocketClient(peerConfig.peer.Ip, peerConfig.peer.Port)
+			peerConfig.client = downloader.ClientSetup(peerConfig.ip, peerConfig.port)
 		}(&synPeerConfig)
 	}
 	wg.Wait()
 	ss.activePeerNumber = 0
 	for _, configPeer := range ss.syncConfig.peers {
-		if configPeer.err == nil {
+		if configPeer.client != nil {
 			ss.activePeerNumber++
-			configPeer.w = bufio.NewWriter(configPeer.conn)
-			configPeer.trusted = true
 		}
 	}
 }
 
 // areConsensusHashesEqual chesk if all consensus hashes are equal.
 func (ss *StateSync) areConsensusHashesEqual() bool {
-	var fixedPeer *SyncPeerConfig
+	var firstPeer *SyncPeerConfig
 	for _, configPeer := range ss.syncConfig.peers {
-		if configPeer.trusted {
-			if fixedPeer == nil {
-				fixedPeer = &configPeer
+		if configPeer.client != nil {
+			if firstPeer == nil {
+				firstPeer = &configPeer
 			}
-			if !reflect.DeepEqual(configPeer.blockHashes, fixedPeer) {
+			if !reflect.DeepEqual(configPeer.blockHashes, firstPeer.blockHashes) {
 				return false
 			}
 		}
@@ -120,29 +139,15 @@ func (ss *StateSync) getConsensusHashes() {
 		wg.Add(ss.activePeerNumber)
 
 		for _, configPeer := range ss.syncConfig.peers {
-			if configPeer.err != nil {
+			if configPeer.client == nil {
 				continue
 			}
 			go func(peerConfig *SyncPeerConfig) {
 				defer wg.Done()
-				msg := proto_node.ConstructBlockchainSyncMessage(proto_node.GetLastBlockHashes, [32]byte{})
-				peerConfig.w.Write(msg)
-				peerConfig.w.Flush()
-				var content []byte
-				content, peerConfig.err = p2p.ReadMessageContent(peerConfig.conn)
-				if peerConfig.err != nil {
-					peerConfig.trusted = false
-					return
-				}
-				var blockchainSyncMessage *proto_node.BlockchainSyncMessage
-				blockchainSyncMessage, peerConfig.err = proto_node.DeserializeBlockchainSyncMessage(content)
-				if peerConfig.err != nil {
-					peerConfig.trusted = false
-					return
-				}
-				peerConfig.blockHashes = blockchainSyncMessage.BlockHashes
+				peerConfig.client.GetBlockHashes()
 			}(&configPeer)
 		}
+		wg.Wait()
 		if ss.areConsensusHashesEqual() {
 			break
 		}
@@ -153,11 +158,12 @@ func (ss *StateSync) getConsensusHashes() {
 func (ss *StateSync) generateStateSyncTaskQueue() {
 	ss.stateSyncTaskQueue = queue.New(0)
 	for _, configPeer := range ss.syncConfig.peers {
-		if configPeer.trusted {
+		if configPeer.client != nil {
 			for id, blockHash := range configPeer.blockHashes {
 				ss.stateSyncTaskQueue.Put(SyncBlockTask{index: id, blockHash: blockHash})
 			}
 			ss.blockHeight = len(configPeer.blockHashes)
+			break
 		}
 	}
 }
@@ -169,7 +175,7 @@ func (ss *StateSync) downloadBlocks(bc *blockchain.Blockchain) {
 	var wg sync.WaitGroup
 	wg.Add(int(ss.stateSyncTaskQueue.Len()))
 	for _, configPeer := range ss.syncConfig.peers {
-		if configPeer.err != nil {
+		if configPeer.client == nil {
 			continue
 		}
 		go func(peerConfig *SyncPeerConfig, stateSyncTaskQueue *queue.Queue, bc *blockchain.Blockchain) {
@@ -180,18 +186,15 @@ func (ss *StateSync) downloadBlocks(bc *blockchain.Blockchain) {
 					break
 				}
 				syncTask := task[0].(SyncBlockTask)
-				msg := proto_node.ConstructBlockchainSyncMessage(proto_node.GetBlock, syncTask.blockHash)
-				peerConfig.w.Write(msg)
-				peerConfig.w.Flush()
-				var content []byte
-				content, peerConfig.err = p2p.ReadMessageContent(peerConfig.conn)
-				if peerConfig.err != nil {
-					peerConfig.trusted = false
-					return
-				}
-				block, err := blockchain.DeserializeBlock(content)
-				if err == nil {
-					bc.Blocks[syncTask.index] = block
+				for {
+					id := syncTask.index
+					heights := []int32{int32(id)}
+					payload, err := peerConfig.GetBlocks(heights)
+					if err != nil {
+						// Write log
+					} else {
+						bc.Blocks[id], err = blockchain.DeserializeBlock(payload[0])
+					}
 				}
 			}
 		}(&configPeer, ss.stateSyncTaskQueue, bc)
@@ -215,7 +218,3 @@ func (ss *StateSync) StartStateSync(peers []p2p.Peer, bc *blockchain.Blockchain)
 
 	ss.downloadBlocks(bc)
 }
-
-func getConsensus(syncConfig *SyncConfig) bool {
-	return true
-}